Method of making composite materials from polydisperse systems

 

(57) Abstract:

Use: manufacture of composite materials for various purposes, such as heat and sound insulation. The inventive method of making composite materials from polydisperse systems is carried out by preparing aqueous slurry of inorganic fibers, mineral powder fillers and synthetic binders with respect to their 120:135:17, respectively, with the addition of her water-soluble compounds with flocculation and complexing action, subsequent molding forced removal of the liquid phase and heat treatment, as an additive, with flocculation and complexing action, use a water-soluble high-molecular compound selected from the group comprising polyacrylamide, polyethylene oxide, a copolymer of acrylamide and dimethylaminoethylmethacrylate hydrochloride, polydimethylaminoethyl acetic acid, alkylated polymers of amino esters of methacrylic acid, alkylated copolymers b aminoalkylated esters of methacrylic acid with N-vinyl pyrrolidone in the form of 0.03 to 3.0% aqueous solution, taken in an amount resultat reach when used as a water-soluble high-molecular compounds of polyethylene oxide (mol. m more 3,0106or copolymer of acrylamide with dimethylaminoethylmethacrylate hydrochloride with mole fractions of acrylamide 50-80% 2 C. p. F.-ly, 1 table.

The invention relates to processes for the manufacture of composite materials, such as heat and sound insulation, from polydisperse systems, which is an aqueous suspension of inorganic fibers, mineral fillers and water-dispersed binder.

Composite materials typically are formed from a dispersion containing particles of the starting components, the size of which can vary by more than 10 times. However due to the difference of velocity sedimentation fibers and filler particles, the difference between the value of the adhesion of the binder to the fibers and the filler is usually having difficulties with a uniform distribution of all components in the product's volume, especially when using low concentrated disperse systems. This effect is particularly evident during the evacuation of excess water environment from the system when the molding in the direction of gravity. The uneven distribution of components in the product's volume leads to instability indicators of product quality, which is not allowed according to the conditions.

reagents, flocculants and coagulants.

A known method of making same a composite material based on an aqueous suspension (1-15%), consisting of 50-95% ceramic fiber, 3-20% of the elastomer (water dispersion) and 0-30% of inorganic filler is injected up to 20% of surface-active substances (surfactants) and with vigorous stirring receive a foamy mass. The latter is formed and subjected to heat treatment. This method is the closest to the technical essence. The role of flocculant and coagulant in the known method performs surfactant. This method can achieve the effect of uniformity only when using a filler with a high degree of grinding (specific surface). However, the application of inorganic filler with a particle size of more than 0.3 mm, the effect of uniformity is greatly reduced. In addition, this method restricts the use of pre-and leads to increased energy consumption when drying products.

An object of the invention is the provision of a uniform distribution of all components in the material volume.

This task is achieved in that in the method of manufacturing composite materials of polydisperse systems by need a kitchen binders with respect to their 120:135:17, respectively, with the addition of her water-soluble compounds, with flocculation and complexing action, subsequent molding forced removal of the liquid phase and heat treatment, as an additive, with flocculation and complexing action, use a water-soluble high-molecular compound selected from the group comprising polyacrylamide, polyethylene oxide, a copolymer of acrylamide with dimethylaminoethylmethacrylate hydrochloride, polydimethylaminoethyl acetic acid, alkylated polymers of amino esters of methacrylic acid, alkylated copolymers-aminoalkylated esters of methacrylic acid with N-vinyl pyrrolidone in the form of 0.03 to 3.0 wt. aqueous solution, taken in an amount of 0.02 to 0.4 wt. from the total mass of all components in terms of dry substance.

Most technical result is achieved by using as the water-soluble high-molecular compounds of polyethylene oxide (mol.m. more 3,0106and copolymer of acrylamide with dimethylaminoethylmethacrylate hydrochloride with mole fractions of acrylamide 50-80% as inorganic fibers used mineral, glass, basalt, silica-alumina, silica and other fiber diameter of from 0.5 to 15 the AK natural, for example, vermiculite, mica, clay, synthetic origin, for example, cement. As a binder used, for example, aqueous dispersions (latexes) synthetic rubbers, for example, chloroprene, isoprene, on BNR, and aqueous dispersion of polyvinyl acetate or copolymers of vinyl acetate with ethylene. As water-soluble compounds with flocculation and complexing action, use polyethylene oxide, polyacrylamide, alkylated polymers of amino esters of methacrylic acid, alkylated copolymers-aminoalkylated esters of methacrylic acid with N-vinyl pyrrolidone, a copolymer of acrylamide with dimethylaminoethylmethacrylate hydrochloride etc.

Implementation of the proposed method is as follows. Prepare aqueous suspension of inorganic fibers, which enter the water dispersion of the binder. Then with continuous stirring injected filler and an aqueous solution of one of the mentioned high-molecular compounds such as polyethylene oxide.

Further stirring for 30-180 with leads to the formation of flocculent suspensions with simultaneous lightening of the liquid phase, after which Prosveshenie if necessary, and heat treatment.

The mechanism to achieve the uniform distribution of all components in the material is as follows.

With the introduction of dilute disperse system of these high-molecular compounds with flocculation and complexing properties and high adhesion to suspended solids, formed a spatial grid of associated molecules of the polymer. Under the influence of electrostatic forces in the water converging negatively charged suspended particles with macromolecules, each of which comes into contact with multiple particles and securely keeps them in suspension and after cessation of mixing. Simultaneous coagulation of the binder, the resulting globules connected with particles of the other components and with them remain in suspension. After removal of the liquid phase of the molded workpiece material have a uniform structure, as all components are evenly distributed over its volume. The method can also be used for moulding articles of any configuration of polydisperse systems containing binder is not able to be fixed on the fibers due to coagulation Poista the proposed materials are given in table.

1. METHOD of MAKING COMPOSITE MATERIALS FROM POLYDISPERSE SYSTEMS through preparation of an aqueous slurry of inorganic fibers, mineral powder fillers and synthetic binder at a ratio of 120:15:17 respectively with the additive in it water-soluble compounds with flocculation and complexing action, subsequent molding forced removal of the liquid phase and heat treatment, characterized in that the additive with flocculation and complexing action, use a water-soluble high-molecular compound selected from the group comprising polyacrylamide, polyethylene oxide, a copolymer of acrylamide with dimethylaminoethylmethacrylate hydrochloride, acetic acid polydimethylaminoethyl, alkylated polymers of amino esters of methacrylic acid, alkylated copolymers b - aminoalkylated esters of methacrylic acid with N-vinylferrocene in the form of 0.03 to 3.0% aqueous solution, taken in an amount of 0.02-0.4% of the total mass of all components in terms of dry substance.

2. The method according to p. 1, characterized in that as the water-soluble high-molecular compounds use pvremove molecular compound used is a copolymer of acrylamide with dimethylaminoethylmethacrylate hydrochloride with mole fractions of acrylamide 50-80%

 

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